Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_mount.h"
13#include "xfs_inode.h"
14#include "xfs_acl.h"
15#include "xfs_quota.h"
16#include "xfs_da_format.h"
17#include "xfs_da_btree.h"
18#include "xfs_attr.h"
19#include "xfs_trans.h"
20#include "xfs_trace.h"
21#include "xfs_icache.h"
22#include "xfs_symlink.h"
23#include "xfs_dir2.h"
24#include "xfs_iomap.h"
25#include "xfs_error.h"
26#include "xfs_ioctl.h"
27#include "xfs_xattr.h"
28
29#include <linux/posix_acl.h>
30#include <linux/security.h>
31#include <linux/iversion.h>
32#include <linux/fiemap.h>
33
34/*
35 * Directories have different lock order w.r.t. mmap_lock compared to regular
36 * files. This is due to readdir potentially triggering page faults on a user
37 * buffer inside filldir(), and this happens with the ilock on the directory
38 * held. For regular files, the lock order is the other way around - the
39 * mmap_lock is taken during the page fault, and then we lock the ilock to do
40 * block mapping. Hence we need a different class for the directory ilock so
41 * that lockdep can tell them apart.
42 */
43static struct lock_class_key xfs_nondir_ilock_class;
44static struct lock_class_key xfs_dir_ilock_class;
45
46static int
47xfs_initxattrs(
48 struct inode *inode,
49 const struct xattr *xattr_array,
50 void *fs_info)
51{
52 const struct xattr *xattr;
53 struct xfs_inode *ip = XFS_I(inode);
54 int error = 0;
55
56 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
57 struct xfs_da_args args = {
58 .dp = ip,
59 .attr_filter = XFS_ATTR_SECURE,
60 .name = xattr->name,
61 .namelen = strlen(xattr->name),
62 .value = xattr->value,
63 .valuelen = xattr->value_len,
64 };
65 error = xfs_attr_change(&args);
66 if (error < 0)
67 break;
68 }
69 return error;
70}
71
72/*
73 * Hook in SELinux. This is not quite correct yet, what we really need
74 * here (as we do for default ACLs) is a mechanism by which creation of
75 * these attrs can be journalled at inode creation time (along with the
76 * inode, of course, such that log replay can't cause these to be lost).
77 */
78int
79xfs_inode_init_security(
80 struct inode *inode,
81 struct inode *dir,
82 const struct qstr *qstr)
83{
84 return security_inode_init_security(inode, dir, qstr,
85 &xfs_initxattrs, NULL);
86}
87
88static void
89xfs_dentry_to_name(
90 struct xfs_name *namep,
91 struct dentry *dentry)
92{
93 namep->name = dentry->d_name.name;
94 namep->len = dentry->d_name.len;
95 namep->type = XFS_DIR3_FT_UNKNOWN;
96}
97
98static int
99xfs_dentry_mode_to_name(
100 struct xfs_name *namep,
101 struct dentry *dentry,
102 int mode)
103{
104 namep->name = dentry->d_name.name;
105 namep->len = dentry->d_name.len;
106 namep->type = xfs_mode_to_ftype(mode);
107
108 if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN))
109 return -EFSCORRUPTED;
110
111 return 0;
112}
113
114STATIC void
115xfs_cleanup_inode(
116 struct inode *dir,
117 struct inode *inode,
118 struct dentry *dentry)
119{
120 struct xfs_name teardown;
121
122 /* Oh, the horror.
123 * If we can't add the ACL or we fail in
124 * xfs_inode_init_security we must back out.
125 * ENOSPC can hit here, among other things.
126 */
127 xfs_dentry_to_name(&teardown, dentry);
128
129 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
130}
131
132/*
133 * Check to see if we are likely to need an extended attribute to be added to
134 * the inode we are about to allocate. This allows the attribute fork to be
135 * created during the inode allocation, reducing the number of transactions we
136 * need to do in this fast path.
137 *
138 * The security checks are optimistic, but not guaranteed. The two LSMs that
139 * require xattrs to be added here (selinux and smack) are also the only two
140 * LSMs that add a sb->s_security structure to the superblock. Hence if security
141 * is enabled and sb->s_security is set, we have a pretty good idea that we are
142 * going to be asked to add a security xattr immediately after allocating the
143 * xfs inode and instantiating the VFS inode.
144 */
145static inline bool
146xfs_create_need_xattr(
147 struct inode *dir,
148 struct posix_acl *default_acl,
149 struct posix_acl *acl)
150{
151 if (acl)
152 return true;
153 if (default_acl)
154 return true;
155#if IS_ENABLED(CONFIG_SECURITY)
156 if (dir->i_sb->s_security)
157 return true;
158#endif
159 return false;
160}
161
162
163STATIC int
164xfs_generic_create(
165 struct user_namespace *mnt_userns,
166 struct inode *dir,
167 struct dentry *dentry,
168 umode_t mode,
169 dev_t rdev,
170 struct file *tmpfile) /* unnamed file */
171{
172 struct inode *inode;
173 struct xfs_inode *ip = NULL;
174 struct posix_acl *default_acl, *acl;
175 struct xfs_name name;
176 int error;
177
178 /*
179 * Irix uses Missed'em'V split, but doesn't want to see
180 * the upper 5 bits of (14bit) major.
181 */
182 if (S_ISCHR(mode) || S_ISBLK(mode)) {
183 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
184 return -EINVAL;
185 } else {
186 rdev = 0;
187 }
188
189 error = posix_acl_create(dir, &mode, &default_acl, &acl);
190 if (error)
191 return error;
192
193 /* Verify mode is valid also for tmpfile case */
194 error = xfs_dentry_mode_to_name(&name, dentry, mode);
195 if (unlikely(error))
196 goto out_free_acl;
197
198 if (!tmpfile) {
199 error = xfs_create(mnt_userns, XFS_I(dir), &name, mode, rdev,
200 xfs_create_need_xattr(dir, default_acl, acl),
201 &ip);
202 } else {
203 error = xfs_create_tmpfile(mnt_userns, XFS_I(dir), mode, &ip);
204 }
205 if (unlikely(error))
206 goto out_free_acl;
207
208 inode = VFS_I(ip);
209
210 error = xfs_inode_init_security(inode, dir, &dentry->d_name);
211 if (unlikely(error))
212 goto out_cleanup_inode;
213
214 if (default_acl) {
215 error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
216 if (error)
217 goto out_cleanup_inode;
218 }
219 if (acl) {
220 error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS);
221 if (error)
222 goto out_cleanup_inode;
223 }
224
225 xfs_setup_iops(ip);
226
227 if (tmpfile) {
228 /*
229 * The VFS requires that any inode fed to d_tmpfile must have
230 * nlink == 1 so that it can decrement the nlink in d_tmpfile.
231 * However, we created the temp file with nlink == 0 because
232 * we're not allowed to put an inode with nlink > 0 on the
233 * unlinked list. Therefore we have to set nlink to 1 so that
234 * d_tmpfile can immediately set it back to zero.
235 */
236 set_nlink(inode, 1);
237 d_tmpfile(tmpfile, inode);
238 } else
239 d_instantiate(dentry, inode);
240
241 xfs_finish_inode_setup(ip);
242
243 out_free_acl:
244 posix_acl_release(default_acl);
245 posix_acl_release(acl);
246 return error;
247
248 out_cleanup_inode:
249 xfs_finish_inode_setup(ip);
250 if (!tmpfile)
251 xfs_cleanup_inode(dir, inode, dentry);
252 xfs_irele(ip);
253 goto out_free_acl;
254}
255
256STATIC int
257xfs_vn_mknod(
258 struct user_namespace *mnt_userns,
259 struct inode *dir,
260 struct dentry *dentry,
261 umode_t mode,
262 dev_t rdev)
263{
264 return xfs_generic_create(mnt_userns, dir, dentry, mode, rdev, NULL);
265}
266
267STATIC int
268xfs_vn_create(
269 struct user_namespace *mnt_userns,
270 struct inode *dir,
271 struct dentry *dentry,
272 umode_t mode,
273 bool flags)
274{
275 return xfs_generic_create(mnt_userns, dir, dentry, mode, 0, NULL);
276}
277
278STATIC int
279xfs_vn_mkdir(
280 struct user_namespace *mnt_userns,
281 struct inode *dir,
282 struct dentry *dentry,
283 umode_t mode)
284{
285 return xfs_generic_create(mnt_userns, dir, dentry, mode | S_IFDIR, 0,
286 NULL);
287}
288
289STATIC struct dentry *
290xfs_vn_lookup(
291 struct inode *dir,
292 struct dentry *dentry,
293 unsigned int flags)
294{
295 struct inode *inode;
296 struct xfs_inode *cip;
297 struct xfs_name name;
298 int error;
299
300 if (dentry->d_name.len >= MAXNAMELEN)
301 return ERR_PTR(-ENAMETOOLONG);
302
303 xfs_dentry_to_name(&name, dentry);
304 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
305 if (likely(!error))
306 inode = VFS_I(cip);
307 else if (likely(error == -ENOENT))
308 inode = NULL;
309 else
310 inode = ERR_PTR(error);
311 return d_splice_alias(inode, dentry);
312}
313
314STATIC struct dentry *
315xfs_vn_ci_lookup(
316 struct inode *dir,
317 struct dentry *dentry,
318 unsigned int flags)
319{
320 struct xfs_inode *ip;
321 struct xfs_name xname;
322 struct xfs_name ci_name;
323 struct qstr dname;
324 int error;
325
326 if (dentry->d_name.len >= MAXNAMELEN)
327 return ERR_PTR(-ENAMETOOLONG);
328
329 xfs_dentry_to_name(&xname, dentry);
330 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
331 if (unlikely(error)) {
332 if (unlikely(error != -ENOENT))
333 return ERR_PTR(error);
334 /*
335 * call d_add(dentry, NULL) here when d_drop_negative_children
336 * is called in xfs_vn_mknod (ie. allow negative dentries
337 * with CI filesystems).
338 */
339 return NULL;
340 }
341
342 /* if exact match, just splice and exit */
343 if (!ci_name.name)
344 return d_splice_alias(VFS_I(ip), dentry);
345
346 /* else case-insensitive match... */
347 dname.name = ci_name.name;
348 dname.len = ci_name.len;
349 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
350 kmem_free(ci_name.name);
351 return dentry;
352}
353
354STATIC int
355xfs_vn_link(
356 struct dentry *old_dentry,
357 struct inode *dir,
358 struct dentry *dentry)
359{
360 struct inode *inode = d_inode(old_dentry);
361 struct xfs_name name;
362 int error;
363
364 error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode);
365 if (unlikely(error))
366 return error;
367
368 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
369 if (unlikely(error))
370 return error;
371
372 ihold(inode);
373 d_instantiate(dentry, inode);
374 return 0;
375}
376
377STATIC int
378xfs_vn_unlink(
379 struct inode *dir,
380 struct dentry *dentry)
381{
382 struct xfs_name name;
383 int error;
384
385 xfs_dentry_to_name(&name, dentry);
386
387 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry)));
388 if (error)
389 return error;
390
391 /*
392 * With unlink, the VFS makes the dentry "negative": no inode,
393 * but still hashed. This is incompatible with case-insensitive
394 * mode, so invalidate (unhash) the dentry in CI-mode.
395 */
396 if (xfs_has_asciici(XFS_M(dir->i_sb)))
397 d_invalidate(dentry);
398 return 0;
399}
400
401STATIC int
402xfs_vn_symlink(
403 struct user_namespace *mnt_userns,
404 struct inode *dir,
405 struct dentry *dentry,
406 const char *symname)
407{
408 struct inode *inode;
409 struct xfs_inode *cip = NULL;
410 struct xfs_name name;
411 int error;
412 umode_t mode;
413
414 mode = S_IFLNK |
415 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
416 error = xfs_dentry_mode_to_name(&name, dentry, mode);
417 if (unlikely(error))
418 goto out;
419
420 error = xfs_symlink(mnt_userns, XFS_I(dir), &name, symname, mode, &cip);
421 if (unlikely(error))
422 goto out;
423
424 inode = VFS_I(cip);
425
426 error = xfs_inode_init_security(inode, dir, &dentry->d_name);
427 if (unlikely(error))
428 goto out_cleanup_inode;
429
430 xfs_setup_iops(cip);
431
432 d_instantiate(dentry, inode);
433 xfs_finish_inode_setup(cip);
434 return 0;
435
436 out_cleanup_inode:
437 xfs_finish_inode_setup(cip);
438 xfs_cleanup_inode(dir, inode, dentry);
439 xfs_irele(cip);
440 out:
441 return error;
442}
443
444STATIC int
445xfs_vn_rename(
446 struct user_namespace *mnt_userns,
447 struct inode *odir,
448 struct dentry *odentry,
449 struct inode *ndir,
450 struct dentry *ndentry,
451 unsigned int flags)
452{
453 struct inode *new_inode = d_inode(ndentry);
454 int omode = 0;
455 int error;
456 struct xfs_name oname;
457 struct xfs_name nname;
458
459 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
460 return -EINVAL;
461
462 /* if we are exchanging files, we need to set i_mode of both files */
463 if (flags & RENAME_EXCHANGE)
464 omode = d_inode(ndentry)->i_mode;
465
466 error = xfs_dentry_mode_to_name(&oname, odentry, omode);
467 if (omode && unlikely(error))
468 return error;
469
470 error = xfs_dentry_mode_to_name(&nname, ndentry,
471 d_inode(odentry)->i_mode);
472 if (unlikely(error))
473 return error;
474
475 return xfs_rename(mnt_userns, XFS_I(odir), &oname,
476 XFS_I(d_inode(odentry)), XFS_I(ndir), &nname,
477 new_inode ? XFS_I(new_inode) : NULL, flags);
478}
479
480/*
481 * careful here - this function can get called recursively, so
482 * we need to be very careful about how much stack we use.
483 * uio is kmalloced for this reason...
484 */
485STATIC const char *
486xfs_vn_get_link(
487 struct dentry *dentry,
488 struct inode *inode,
489 struct delayed_call *done)
490{
491 char *link;
492 int error = -ENOMEM;
493
494 if (!dentry)
495 return ERR_PTR(-ECHILD);
496
497 link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL);
498 if (!link)
499 goto out_err;
500
501 error = xfs_readlink(XFS_I(d_inode(dentry)), link);
502 if (unlikely(error))
503 goto out_kfree;
504
505 set_delayed_call(done, kfree_link, link);
506 return link;
507
508 out_kfree:
509 kfree(link);
510 out_err:
511 return ERR_PTR(error);
512}
513
514static uint32_t
515xfs_stat_blksize(
516 struct xfs_inode *ip)
517{
518 struct xfs_mount *mp = ip->i_mount;
519
520 /*
521 * If the file blocks are being allocated from a realtime volume, then
522 * always return the realtime extent size.
523 */
524 if (XFS_IS_REALTIME_INODE(ip))
525 return XFS_FSB_TO_B(mp, xfs_get_extsz_hint(ip));
526
527 /*
528 * Allow large block sizes to be reported to userspace programs if the
529 * "largeio" mount option is used.
530 *
531 * If compatibility mode is specified, simply return the basic unit of
532 * caching so that we don't get inefficient read/modify/write I/O from
533 * user apps. Otherwise....
534 *
535 * If the underlying volume is a stripe, then return the stripe width in
536 * bytes as the recommended I/O size. It is not a stripe and we've set a
537 * default buffered I/O size, return that, otherwise return the compat
538 * default.
539 */
540 if (xfs_has_large_iosize(mp)) {
541 if (mp->m_swidth)
542 return XFS_FSB_TO_B(mp, mp->m_swidth);
543 if (xfs_has_allocsize(mp))
544 return 1U << mp->m_allocsize_log;
545 }
546
547 return PAGE_SIZE;
548}
549
550STATIC int
551xfs_vn_getattr(
552 struct user_namespace *mnt_userns,
553 const struct path *path,
554 struct kstat *stat,
555 u32 request_mask,
556 unsigned int query_flags)
557{
558 struct inode *inode = d_inode(path->dentry);
559 struct xfs_inode *ip = XFS_I(inode);
560 struct xfs_mount *mp = ip->i_mount;
561 vfsuid_t vfsuid = i_uid_into_vfsuid(mnt_userns, inode);
562 vfsgid_t vfsgid = i_gid_into_vfsgid(mnt_userns, inode);
563
564 trace_xfs_getattr(ip);
565
566 if (xfs_is_shutdown(mp))
567 return -EIO;
568
569 stat->size = XFS_ISIZE(ip);
570 stat->dev = inode->i_sb->s_dev;
571 stat->mode = inode->i_mode;
572 stat->nlink = inode->i_nlink;
573 stat->uid = vfsuid_into_kuid(vfsuid);
574 stat->gid = vfsgid_into_kgid(vfsgid);
575 stat->ino = ip->i_ino;
576 stat->atime = inode->i_atime;
577 stat->mtime = inode->i_mtime;
578 stat->ctime = inode->i_ctime;
579 stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks);
580
581 if (xfs_has_v3inodes(mp)) {
582 if (request_mask & STATX_BTIME) {
583 stat->result_mask |= STATX_BTIME;
584 stat->btime = ip->i_crtime;
585 }
586 }
587
588 /*
589 * Note: If you add another clause to set an attribute flag, please
590 * update attributes_mask below.
591 */
592 if (ip->i_diflags & XFS_DIFLAG_IMMUTABLE)
593 stat->attributes |= STATX_ATTR_IMMUTABLE;
594 if (ip->i_diflags & XFS_DIFLAG_APPEND)
595 stat->attributes |= STATX_ATTR_APPEND;
596 if (ip->i_diflags & XFS_DIFLAG_NODUMP)
597 stat->attributes |= STATX_ATTR_NODUMP;
598
599 stat->attributes_mask |= (STATX_ATTR_IMMUTABLE |
600 STATX_ATTR_APPEND |
601 STATX_ATTR_NODUMP);
602
603 switch (inode->i_mode & S_IFMT) {
604 case S_IFBLK:
605 case S_IFCHR:
606 stat->blksize = BLKDEV_IOSIZE;
607 stat->rdev = inode->i_rdev;
608 break;
609 case S_IFREG:
610 if (request_mask & STATX_DIOALIGN) {
611 struct xfs_buftarg *target = xfs_inode_buftarg(ip);
612 struct block_device *bdev = target->bt_bdev;
613
614 stat->result_mask |= STATX_DIOALIGN;
615 stat->dio_mem_align = bdev_dma_alignment(bdev) + 1;
616 stat->dio_offset_align = bdev_logical_block_size(bdev);
617 }
618 fallthrough;
619 default:
620 stat->blksize = xfs_stat_blksize(ip);
621 stat->rdev = 0;
622 break;
623 }
624
625 return 0;
626}
627
628static int
629xfs_vn_change_ok(
630 struct user_namespace *mnt_userns,
631 struct dentry *dentry,
632 struct iattr *iattr)
633{
634 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount;
635
636 if (xfs_is_readonly(mp))
637 return -EROFS;
638
639 if (xfs_is_shutdown(mp))
640 return -EIO;
641
642 return setattr_prepare(mnt_userns, dentry, iattr);
643}
644
645/*
646 * Set non-size attributes of an inode.
647 *
648 * Caution: The caller of this function is responsible for calling
649 * setattr_prepare() or otherwise verifying the change is fine.
650 */
651static int
652xfs_setattr_nonsize(
653 struct user_namespace *mnt_userns,
654 struct dentry *dentry,
655 struct xfs_inode *ip,
656 struct iattr *iattr)
657{
658 xfs_mount_t *mp = ip->i_mount;
659 struct inode *inode = VFS_I(ip);
660 int mask = iattr->ia_valid;
661 xfs_trans_t *tp;
662 int error;
663 kuid_t uid = GLOBAL_ROOT_UID;
664 kgid_t gid = GLOBAL_ROOT_GID;
665 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
666 struct xfs_dquot *old_udqp = NULL, *old_gdqp = NULL;
667
668 ASSERT((mask & ATTR_SIZE) == 0);
669
670 /*
671 * If disk quotas is on, we make sure that the dquots do exist on disk,
672 * before we start any other transactions. Trying to do this later
673 * is messy. We don't care to take a readlock to look at the ids
674 * in inode here, because we can't hold it across the trans_reserve.
675 * If the IDs do change before we take the ilock, we're covered
676 * because the i_*dquot fields will get updated anyway.
677 */
678 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
679 uint qflags = 0;
680
681 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
682 uid = from_vfsuid(mnt_userns, i_user_ns(inode),
683 iattr->ia_vfsuid);
684 qflags |= XFS_QMOPT_UQUOTA;
685 } else {
686 uid = inode->i_uid;
687 }
688 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
689 gid = from_vfsgid(mnt_userns, i_user_ns(inode),
690 iattr->ia_vfsgid);
691 qflags |= XFS_QMOPT_GQUOTA;
692 } else {
693 gid = inode->i_gid;
694 }
695
696 /*
697 * We take a reference when we initialize udqp and gdqp,
698 * so it is important that we never blindly double trip on
699 * the same variable. See xfs_create() for an example.
700 */
701 ASSERT(udqp == NULL);
702 ASSERT(gdqp == NULL);
703 error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_projid,
704 qflags, &udqp, &gdqp, NULL);
705 if (error)
706 return error;
707 }
708
709 error = xfs_trans_alloc_ichange(ip, udqp, gdqp, NULL,
710 has_capability_noaudit(current, CAP_FOWNER), &tp);
711 if (error)
712 goto out_dqrele;
713
714 /*
715 * Register quota modifications in the transaction. Must be the owner
716 * or privileged. These IDs could have changed since we last looked at
717 * them. But, we're assured that if the ownership did change while we
718 * didn't have the inode locked, inode's dquot(s) would have changed
719 * also.
720 */
721 if (XFS_IS_UQUOTA_ON(mp) &&
722 i_uid_needs_update(mnt_userns, iattr, inode)) {
723 ASSERT(udqp);
724 old_udqp = xfs_qm_vop_chown(tp, ip, &ip->i_udquot, udqp);
725 }
726 if (XFS_IS_GQUOTA_ON(mp) &&
727 i_gid_needs_update(mnt_userns, iattr, inode)) {
728 ASSERT(xfs_has_pquotino(mp) || !XFS_IS_PQUOTA_ON(mp));
729 ASSERT(gdqp);
730 old_gdqp = xfs_qm_vop_chown(tp, ip, &ip->i_gdquot, gdqp);
731 }
732
733 setattr_copy(mnt_userns, inode, iattr);
734 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
735
736 XFS_STATS_INC(mp, xs_ig_attrchg);
737
738 if (xfs_has_wsync(mp))
739 xfs_trans_set_sync(tp);
740 error = xfs_trans_commit(tp);
741
742 /*
743 * Release any dquot(s) the inode had kept before chown.
744 */
745 xfs_qm_dqrele(old_udqp);
746 xfs_qm_dqrele(old_gdqp);
747 xfs_qm_dqrele(udqp);
748 xfs_qm_dqrele(gdqp);
749
750 if (error)
751 return error;
752
753 /*
754 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
755 * update. We could avoid this with linked transactions
756 * and passing down the transaction pointer all the way
757 * to attr_set. No previous user of the generic
758 * Posix ACL code seems to care about this issue either.
759 */
760 if (mask & ATTR_MODE) {
761 error = posix_acl_chmod(mnt_userns, dentry, inode->i_mode);
762 if (error)
763 return error;
764 }
765
766 return 0;
767
768out_dqrele:
769 xfs_qm_dqrele(udqp);
770 xfs_qm_dqrele(gdqp);
771 return error;
772}
773
774/*
775 * Truncate file. Must have write permission and not be a directory.
776 *
777 * Caution: The caller of this function is responsible for calling
778 * setattr_prepare() or otherwise verifying the change is fine.
779 */
780STATIC int
781xfs_setattr_size(
782 struct user_namespace *mnt_userns,
783 struct dentry *dentry,
784 struct xfs_inode *ip,
785 struct iattr *iattr)
786{
787 struct xfs_mount *mp = ip->i_mount;
788 struct inode *inode = VFS_I(ip);
789 xfs_off_t oldsize, newsize;
790 struct xfs_trans *tp;
791 int error;
792 uint lock_flags = 0;
793 bool did_zeroing = false;
794
795 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
796 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL));
797 ASSERT(S_ISREG(inode->i_mode));
798 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
799 ATTR_MTIME_SET|ATTR_TIMES_SET)) == 0);
800
801 oldsize = inode->i_size;
802 newsize = iattr->ia_size;
803
804 /*
805 * Short circuit the truncate case for zero length files.
806 */
807 if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) {
808 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME)))
809 return 0;
810
811 /*
812 * Use the regular setattr path to update the timestamps.
813 */
814 iattr->ia_valid &= ~ATTR_SIZE;
815 return xfs_setattr_nonsize(mnt_userns, dentry, ip, iattr);
816 }
817
818 /*
819 * Make sure that the dquots are attached to the inode.
820 */
821 error = xfs_qm_dqattach(ip);
822 if (error)
823 return error;
824
825 /*
826 * Wait for all direct I/O to complete.
827 */
828 inode_dio_wait(inode);
829
830 /*
831 * File data changes must be complete before we start the transaction to
832 * modify the inode. This needs to be done before joining the inode to
833 * the transaction because the inode cannot be unlocked once it is a
834 * part of the transaction.
835 *
836 * Start with zeroing any data beyond EOF that we may expose on file
837 * extension, or zeroing out the rest of the block on a downward
838 * truncate.
839 */
840 if (newsize > oldsize) {
841 trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
842 error = xfs_zero_range(ip, oldsize, newsize - oldsize,
843 &did_zeroing);
844 } else {
845 /*
846 * iomap won't detect a dirty page over an unwritten block (or a
847 * cow block over a hole) and subsequently skips zeroing the
848 * newly post-EOF portion of the page. Flush the new EOF to
849 * convert the block before the pagecache truncate.
850 */
851 error = filemap_write_and_wait_range(inode->i_mapping, newsize,
852 newsize);
853 if (error)
854 return error;
855 error = xfs_truncate_page(ip, newsize, &did_zeroing);
856 }
857
858 if (error)
859 return error;
860
861 /*
862 * We've already locked out new page faults, so now we can safely remove
863 * pages from the page cache knowing they won't get refaulted until we
864 * drop the XFS_MMAP_EXCL lock after the extent manipulations are
865 * complete. The truncate_setsize() call also cleans partial EOF page
866 * PTEs on extending truncates and hence ensures sub-page block size
867 * filesystems are correctly handled, too.
868 *
869 * We have to do all the page cache truncate work outside the
870 * transaction context as the "lock" order is page lock->log space
871 * reservation as defined by extent allocation in the writeback path.
872 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but
873 * having already truncated the in-memory version of the file (i.e. made
874 * user visible changes). There's not much we can do about this, except
875 * to hope that the caller sees ENOMEM and retries the truncate
876 * operation.
877 *
878 * And we update in-core i_size and truncate page cache beyond newsize
879 * before writeback the [i_disk_size, newsize] range, so we're
880 * guaranteed not to write stale data past the new EOF on truncate down.
881 */
882 truncate_setsize(inode, newsize);
883
884 /*
885 * We are going to log the inode size change in this transaction so
886 * any previous writes that are beyond the on disk EOF and the new
887 * EOF that have not been written out need to be written here. If we
888 * do not write the data out, we expose ourselves to the null files
889 * problem. Note that this includes any block zeroing we did above;
890 * otherwise those blocks may not be zeroed after a crash.
891 */
892 if (did_zeroing ||
893 (newsize > ip->i_disk_size && oldsize != ip->i_disk_size)) {
894 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
895 ip->i_disk_size, newsize - 1);
896 if (error)
897 return error;
898 }
899
900 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
901 if (error)
902 return error;
903
904 lock_flags |= XFS_ILOCK_EXCL;
905 xfs_ilock(ip, XFS_ILOCK_EXCL);
906 xfs_trans_ijoin(tp, ip, 0);
907
908 /*
909 * Only change the c/mtime if we are changing the size or we are
910 * explicitly asked to change it. This handles the semantic difference
911 * between truncate() and ftruncate() as implemented in the VFS.
912 *
913 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
914 * special case where we need to update the times despite not having
915 * these flags set. For all other operations the VFS set these flags
916 * explicitly if it wants a timestamp update.
917 */
918 if (newsize != oldsize &&
919 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
920 iattr->ia_ctime = iattr->ia_mtime =
921 current_time(inode);
922 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
923 }
924
925 /*
926 * The first thing we do is set the size to new_size permanently on
927 * disk. This way we don't have to worry about anyone ever being able
928 * to look at the data being freed even in the face of a crash.
929 * What we're getting around here is the case where we free a block, it
930 * is allocated to another file, it is written to, and then we crash.
931 * If the new data gets written to the file but the log buffers
932 * containing the free and reallocation don't, then we'd end up with
933 * garbage in the blocks being freed. As long as we make the new size
934 * permanent before actually freeing any blocks it doesn't matter if
935 * they get written to.
936 */
937 ip->i_disk_size = newsize;
938 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
939
940 if (newsize <= oldsize) {
941 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
942 if (error)
943 goto out_trans_cancel;
944
945 /*
946 * Truncated "down", so we're removing references to old data
947 * here - if we delay flushing for a long time, we expose
948 * ourselves unduly to the notorious NULL files problem. So,
949 * we mark this inode and flush it when the file is closed,
950 * and do not wait the usual (long) time for writeout.
951 */
952 xfs_iflags_set(ip, XFS_ITRUNCATED);
953
954 /* A truncate down always removes post-EOF blocks. */
955 xfs_inode_clear_eofblocks_tag(ip);
956 }
957
958 ASSERT(!(iattr->ia_valid & (ATTR_UID | ATTR_GID)));
959 setattr_copy(mnt_userns, inode, iattr);
960 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
961
962 XFS_STATS_INC(mp, xs_ig_attrchg);
963
964 if (xfs_has_wsync(mp))
965 xfs_trans_set_sync(tp);
966
967 error = xfs_trans_commit(tp);
968out_unlock:
969 if (lock_flags)
970 xfs_iunlock(ip, lock_flags);
971 return error;
972
973out_trans_cancel:
974 xfs_trans_cancel(tp);
975 goto out_unlock;
976}
977
978int
979xfs_vn_setattr_size(
980 struct user_namespace *mnt_userns,
981 struct dentry *dentry,
982 struct iattr *iattr)
983{
984 struct xfs_inode *ip = XFS_I(d_inode(dentry));
985 int error;
986
987 trace_xfs_setattr(ip);
988
989 error = xfs_vn_change_ok(mnt_userns, dentry, iattr);
990 if (error)
991 return error;
992 return xfs_setattr_size(mnt_userns, dentry, ip, iattr);
993}
994
995STATIC int
996xfs_vn_setattr(
997 struct user_namespace *mnt_userns,
998 struct dentry *dentry,
999 struct iattr *iattr)
1000{
1001 struct inode *inode = d_inode(dentry);
1002 struct xfs_inode *ip = XFS_I(inode);
1003 int error;
1004
1005 if (iattr->ia_valid & ATTR_SIZE) {
1006 uint iolock;
1007
1008 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
1009 iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
1010
1011 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
1012 if (error) {
1013 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1014 return error;
1015 }
1016
1017 error = xfs_vn_setattr_size(mnt_userns, dentry, iattr);
1018 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
1019 } else {
1020 trace_xfs_setattr(ip);
1021
1022 error = xfs_vn_change_ok(mnt_userns, dentry, iattr);
1023 if (!error)
1024 error = xfs_setattr_nonsize(mnt_userns, dentry, ip, iattr);
1025 }
1026
1027 return error;
1028}
1029
1030STATIC int
1031xfs_vn_update_time(
1032 struct inode *inode,
1033 struct timespec64 *now,
1034 int flags)
1035{
1036 struct xfs_inode *ip = XFS_I(inode);
1037 struct xfs_mount *mp = ip->i_mount;
1038 int log_flags = XFS_ILOG_TIMESTAMP;
1039 struct xfs_trans *tp;
1040 int error;
1041
1042 trace_xfs_update_time(ip);
1043
1044 if (inode->i_sb->s_flags & SB_LAZYTIME) {
1045 if (!((flags & S_VERSION) &&
1046 inode_maybe_inc_iversion(inode, false)))
1047 return generic_update_time(inode, now, flags);
1048
1049 /* Capture the iversion update that just occurred */
1050 log_flags |= XFS_ILOG_CORE;
1051 }
1052
1053 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
1054 if (error)
1055 return error;
1056
1057 xfs_ilock(ip, XFS_ILOCK_EXCL);
1058 if (flags & S_CTIME)
1059 inode->i_ctime = *now;
1060 if (flags & S_MTIME)
1061 inode->i_mtime = *now;
1062 if (flags & S_ATIME)
1063 inode->i_atime = *now;
1064
1065 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1066 xfs_trans_log_inode(tp, ip, log_flags);
1067 return xfs_trans_commit(tp);
1068}
1069
1070STATIC int
1071xfs_vn_fiemap(
1072 struct inode *inode,
1073 struct fiemap_extent_info *fieinfo,
1074 u64 start,
1075 u64 length)
1076{
1077 int error;
1078
1079 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
1080 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
1081 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
1082 error = iomap_fiemap(inode, fieinfo, start, length,
1083 &xfs_xattr_iomap_ops);
1084 } else {
1085 error = iomap_fiemap(inode, fieinfo, start, length,
1086 &xfs_read_iomap_ops);
1087 }
1088 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
1089
1090 return error;
1091}
1092
1093STATIC int
1094xfs_vn_tmpfile(
1095 struct user_namespace *mnt_userns,
1096 struct inode *dir,
1097 struct file *file,
1098 umode_t mode)
1099{
1100 int err = xfs_generic_create(mnt_userns, dir, file->f_path.dentry, mode, 0, file);
1101
1102 return finish_open_simple(file, err);
1103}
1104
1105static const struct inode_operations xfs_inode_operations = {
1106 .get_inode_acl = xfs_get_acl,
1107 .set_acl = xfs_set_acl,
1108 .getattr = xfs_vn_getattr,
1109 .setattr = xfs_vn_setattr,
1110 .listxattr = xfs_vn_listxattr,
1111 .fiemap = xfs_vn_fiemap,
1112 .update_time = xfs_vn_update_time,
1113 .fileattr_get = xfs_fileattr_get,
1114 .fileattr_set = xfs_fileattr_set,
1115};
1116
1117static const struct inode_operations xfs_dir_inode_operations = {
1118 .create = xfs_vn_create,
1119 .lookup = xfs_vn_lookup,
1120 .link = xfs_vn_link,
1121 .unlink = xfs_vn_unlink,
1122 .symlink = xfs_vn_symlink,
1123 .mkdir = xfs_vn_mkdir,
1124 /*
1125 * Yes, XFS uses the same method for rmdir and unlink.
1126 *
1127 * There are some subtile differences deeper in the code,
1128 * but we use S_ISDIR to check for those.
1129 */
1130 .rmdir = xfs_vn_unlink,
1131 .mknod = xfs_vn_mknod,
1132 .rename = xfs_vn_rename,
1133 .get_inode_acl = xfs_get_acl,
1134 .set_acl = xfs_set_acl,
1135 .getattr = xfs_vn_getattr,
1136 .setattr = xfs_vn_setattr,
1137 .listxattr = xfs_vn_listxattr,
1138 .update_time = xfs_vn_update_time,
1139 .tmpfile = xfs_vn_tmpfile,
1140 .fileattr_get = xfs_fileattr_get,
1141 .fileattr_set = xfs_fileattr_set,
1142};
1143
1144static const struct inode_operations xfs_dir_ci_inode_operations = {
1145 .create = xfs_vn_create,
1146 .lookup = xfs_vn_ci_lookup,
1147 .link = xfs_vn_link,
1148 .unlink = xfs_vn_unlink,
1149 .symlink = xfs_vn_symlink,
1150 .mkdir = xfs_vn_mkdir,
1151 /*
1152 * Yes, XFS uses the same method for rmdir and unlink.
1153 *
1154 * There are some subtile differences deeper in the code,
1155 * but we use S_ISDIR to check for those.
1156 */
1157 .rmdir = xfs_vn_unlink,
1158 .mknod = xfs_vn_mknod,
1159 .rename = xfs_vn_rename,
1160 .get_inode_acl = xfs_get_acl,
1161 .set_acl = xfs_set_acl,
1162 .getattr = xfs_vn_getattr,
1163 .setattr = xfs_vn_setattr,
1164 .listxattr = xfs_vn_listxattr,
1165 .update_time = xfs_vn_update_time,
1166 .tmpfile = xfs_vn_tmpfile,
1167 .fileattr_get = xfs_fileattr_get,
1168 .fileattr_set = xfs_fileattr_set,
1169};
1170
1171static const struct inode_operations xfs_symlink_inode_operations = {
1172 .get_link = xfs_vn_get_link,
1173 .getattr = xfs_vn_getattr,
1174 .setattr = xfs_vn_setattr,
1175 .listxattr = xfs_vn_listxattr,
1176 .update_time = xfs_vn_update_time,
1177};
1178
1179/* Figure out if this file actually supports DAX. */
1180static bool
1181xfs_inode_supports_dax(
1182 struct xfs_inode *ip)
1183{
1184 struct xfs_mount *mp = ip->i_mount;
1185
1186 /* Only supported on regular files. */
1187 if (!S_ISREG(VFS_I(ip)->i_mode))
1188 return false;
1189
1190 /* Block size must match page size */
1191 if (mp->m_sb.sb_blocksize != PAGE_SIZE)
1192 return false;
1193
1194 /* Device has to support DAX too. */
1195 return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
1196}
1197
1198static bool
1199xfs_inode_should_enable_dax(
1200 struct xfs_inode *ip)
1201{
1202 if (!IS_ENABLED(CONFIG_FS_DAX))
1203 return false;
1204 if (xfs_has_dax_never(ip->i_mount))
1205 return false;
1206 if (!xfs_inode_supports_dax(ip))
1207 return false;
1208 if (xfs_has_dax_always(ip->i_mount))
1209 return true;
1210 if (ip->i_diflags2 & XFS_DIFLAG2_DAX)
1211 return true;
1212 return false;
1213}
1214
1215void
1216xfs_diflags_to_iflags(
1217 struct xfs_inode *ip,
1218 bool init)
1219{
1220 struct inode *inode = VFS_I(ip);
1221 unsigned int xflags = xfs_ip2xflags(ip);
1222 unsigned int flags = 0;
1223
1224 ASSERT(!(IS_DAX(inode) && init));
1225
1226 if (xflags & FS_XFLAG_IMMUTABLE)
1227 flags |= S_IMMUTABLE;
1228 if (xflags & FS_XFLAG_APPEND)
1229 flags |= S_APPEND;
1230 if (xflags & FS_XFLAG_SYNC)
1231 flags |= S_SYNC;
1232 if (xflags & FS_XFLAG_NOATIME)
1233 flags |= S_NOATIME;
1234 if (init && xfs_inode_should_enable_dax(ip))
1235 flags |= S_DAX;
1236
1237 /*
1238 * S_DAX can only be set during inode initialization and is never set by
1239 * the VFS, so we cannot mask off S_DAX in i_flags.
1240 */
1241 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME);
1242 inode->i_flags |= flags;
1243}
1244
1245/*
1246 * Initialize the Linux inode.
1247 *
1248 * When reading existing inodes from disk this is called directly from xfs_iget,
1249 * when creating a new inode it is called from xfs_init_new_inode after setting
1250 * up the inode. These callers have different criteria for clearing XFS_INEW, so
1251 * leave it up to the caller to deal with unlocking the inode appropriately.
1252 */
1253void
1254xfs_setup_inode(
1255 struct xfs_inode *ip)
1256{
1257 struct inode *inode = &ip->i_vnode;
1258 gfp_t gfp_mask;
1259
1260 inode->i_ino = ip->i_ino;
1261 inode->i_state |= I_NEW;
1262
1263 inode_sb_list_add(inode);
1264 /* make the inode look hashed for the writeback code */
1265 inode_fake_hash(inode);
1266
1267 i_size_write(inode, ip->i_disk_size);
1268 xfs_diflags_to_iflags(ip, true);
1269
1270 if (S_ISDIR(inode->i_mode)) {
1271 /*
1272 * We set the i_rwsem class here to avoid potential races with
1273 * lockdep_annotate_inode_mutex_key() reinitialising the lock
1274 * after a filehandle lookup has already found the inode in
1275 * cache before it has been unlocked via unlock_new_inode().
1276 */
1277 lockdep_set_class(&inode->i_rwsem,
1278 &inode->i_sb->s_type->i_mutex_dir_key);
1279 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class);
1280 } else {
1281 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class);
1282 }
1283
1284 /*
1285 * Ensure all page cache allocations are done from GFP_NOFS context to
1286 * prevent direct reclaim recursion back into the filesystem and blowing
1287 * stacks or deadlocking.
1288 */
1289 gfp_mask = mapping_gfp_mask(inode->i_mapping);
1290 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
1291
1292 /*
1293 * If there is no attribute fork no ACL can exist on this inode,
1294 * and it can't have any file capabilities attached to it either.
1295 */
1296 if (!xfs_inode_has_attr_fork(ip)) {
1297 inode_has_no_xattr(inode);
1298 cache_no_acl(inode);
1299 }
1300}
1301
1302void
1303xfs_setup_iops(
1304 struct xfs_inode *ip)
1305{
1306 struct inode *inode = &ip->i_vnode;
1307
1308 switch (inode->i_mode & S_IFMT) {
1309 case S_IFREG:
1310 inode->i_op = &xfs_inode_operations;
1311 inode->i_fop = &xfs_file_operations;
1312 if (IS_DAX(inode))
1313 inode->i_mapping->a_ops = &xfs_dax_aops;
1314 else
1315 inode->i_mapping->a_ops = &xfs_address_space_operations;
1316 break;
1317 case S_IFDIR:
1318 if (xfs_has_asciici(XFS_M(inode->i_sb)))
1319 inode->i_op = &xfs_dir_ci_inode_operations;
1320 else
1321 inode->i_op = &xfs_dir_inode_operations;
1322 inode->i_fop = &xfs_dir_file_operations;
1323 break;
1324 case S_IFLNK:
1325 inode->i_op = &xfs_symlink_inode_operations;
1326 break;
1327 default:
1328 inode->i_op = &xfs_inode_operations;
1329 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1330 break;
1331 }
1332}
1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_acl.h"
21#include "xfs_log.h"
22#include "xfs_trans.h"
23#include "xfs_sb.h"
24#include "xfs_ag.h"
25#include "xfs_alloc.h"
26#include "xfs_quota.h"
27#include "xfs_mount.h"
28#include "xfs_bmap_btree.h"
29#include "xfs_dinode.h"
30#include "xfs_inode.h"
31#include "xfs_bmap.h"
32#include "xfs_rtalloc.h"
33#include "xfs_error.h"
34#include "xfs_itable.h"
35#include "xfs_attr.h"
36#include "xfs_buf_item.h"
37#include "xfs_utils.h"
38#include "xfs_vnodeops.h"
39#include "xfs_inode_item.h"
40#include "xfs_trace.h"
41
42#include <linux/capability.h>
43#include <linux/xattr.h>
44#include <linux/namei.h>
45#include <linux/posix_acl.h>
46#include <linux/security.h>
47#include <linux/fiemap.h>
48#include <linux/slab.h>
49
50static int
51xfs_initxattrs(
52 struct inode *inode,
53 const struct xattr *xattr_array,
54 void *fs_info)
55{
56 const struct xattr *xattr;
57 struct xfs_inode *ip = XFS_I(inode);
58 int error = 0;
59
60 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
61 error = xfs_attr_set(ip, xattr->name, xattr->value,
62 xattr->value_len, ATTR_SECURE);
63 if (error < 0)
64 break;
65 }
66 return error;
67}
68
69/*
70 * Hook in SELinux. This is not quite correct yet, what we really need
71 * here (as we do for default ACLs) is a mechanism by which creation of
72 * these attrs can be journalled at inode creation time (along with the
73 * inode, of course, such that log replay can't cause these to be lost).
74 */
75
76STATIC int
77xfs_init_security(
78 struct inode *inode,
79 struct inode *dir,
80 const struct qstr *qstr)
81{
82 return security_inode_init_security(inode, dir, qstr,
83 &xfs_initxattrs, NULL);
84}
85
86static void
87xfs_dentry_to_name(
88 struct xfs_name *namep,
89 struct dentry *dentry)
90{
91 namep->name = dentry->d_name.name;
92 namep->len = dentry->d_name.len;
93}
94
95STATIC void
96xfs_cleanup_inode(
97 struct inode *dir,
98 struct inode *inode,
99 struct dentry *dentry)
100{
101 struct xfs_name teardown;
102
103 /* Oh, the horror.
104 * If we can't add the ACL or we fail in
105 * xfs_init_security we must back out.
106 * ENOSPC can hit here, among other things.
107 */
108 xfs_dentry_to_name(&teardown, dentry);
109
110 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
111 iput(inode);
112}
113
114STATIC int
115xfs_vn_mknod(
116 struct inode *dir,
117 struct dentry *dentry,
118 umode_t mode,
119 dev_t rdev)
120{
121 struct inode *inode;
122 struct xfs_inode *ip = NULL;
123 struct posix_acl *default_acl = NULL;
124 struct xfs_name name;
125 int error;
126
127 /*
128 * Irix uses Missed'em'V split, but doesn't want to see
129 * the upper 5 bits of (14bit) major.
130 */
131 if (S_ISCHR(mode) || S_ISBLK(mode)) {
132 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
133 return -EINVAL;
134 rdev = sysv_encode_dev(rdev);
135 } else {
136 rdev = 0;
137 }
138
139 if (IS_POSIXACL(dir)) {
140 default_acl = xfs_get_acl(dir, ACL_TYPE_DEFAULT);
141 if (IS_ERR(default_acl))
142 return PTR_ERR(default_acl);
143
144 if (!default_acl)
145 mode &= ~current_umask();
146 }
147
148 xfs_dentry_to_name(&name, dentry);
149 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
150 if (unlikely(error))
151 goto out_free_acl;
152
153 inode = VFS_I(ip);
154
155 error = xfs_init_security(inode, dir, &dentry->d_name);
156 if (unlikely(error))
157 goto out_cleanup_inode;
158
159 if (default_acl) {
160 error = -xfs_inherit_acl(inode, default_acl);
161 default_acl = NULL;
162 if (unlikely(error))
163 goto out_cleanup_inode;
164 }
165
166
167 d_instantiate(dentry, inode);
168 return -error;
169
170 out_cleanup_inode:
171 xfs_cleanup_inode(dir, inode, dentry);
172 out_free_acl:
173 posix_acl_release(default_acl);
174 return -error;
175}
176
177STATIC int
178xfs_vn_create(
179 struct inode *dir,
180 struct dentry *dentry,
181 umode_t mode,
182 struct nameidata *nd)
183{
184 return xfs_vn_mknod(dir, dentry, mode, 0);
185}
186
187STATIC int
188xfs_vn_mkdir(
189 struct inode *dir,
190 struct dentry *dentry,
191 umode_t mode)
192{
193 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
194}
195
196STATIC struct dentry *
197xfs_vn_lookup(
198 struct inode *dir,
199 struct dentry *dentry,
200 struct nameidata *nd)
201{
202 struct xfs_inode *cip;
203 struct xfs_name name;
204 int error;
205
206 if (dentry->d_name.len >= MAXNAMELEN)
207 return ERR_PTR(-ENAMETOOLONG);
208
209 xfs_dentry_to_name(&name, dentry);
210 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
211 if (unlikely(error)) {
212 if (unlikely(error != ENOENT))
213 return ERR_PTR(-error);
214 d_add(dentry, NULL);
215 return NULL;
216 }
217
218 return d_splice_alias(VFS_I(cip), dentry);
219}
220
221STATIC struct dentry *
222xfs_vn_ci_lookup(
223 struct inode *dir,
224 struct dentry *dentry,
225 struct nameidata *nd)
226{
227 struct xfs_inode *ip;
228 struct xfs_name xname;
229 struct xfs_name ci_name;
230 struct qstr dname;
231 int error;
232
233 if (dentry->d_name.len >= MAXNAMELEN)
234 return ERR_PTR(-ENAMETOOLONG);
235
236 xfs_dentry_to_name(&xname, dentry);
237 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
238 if (unlikely(error)) {
239 if (unlikely(error != ENOENT))
240 return ERR_PTR(-error);
241 /*
242 * call d_add(dentry, NULL) here when d_drop_negative_children
243 * is called in xfs_vn_mknod (ie. allow negative dentries
244 * with CI filesystems).
245 */
246 return NULL;
247 }
248
249 /* if exact match, just splice and exit */
250 if (!ci_name.name)
251 return d_splice_alias(VFS_I(ip), dentry);
252
253 /* else case-insensitive match... */
254 dname.name = ci_name.name;
255 dname.len = ci_name.len;
256 dentry = d_add_ci(dentry, VFS_I(ip), &dname);
257 kmem_free(ci_name.name);
258 return dentry;
259}
260
261STATIC int
262xfs_vn_link(
263 struct dentry *old_dentry,
264 struct inode *dir,
265 struct dentry *dentry)
266{
267 struct inode *inode = old_dentry->d_inode;
268 struct xfs_name name;
269 int error;
270
271 xfs_dentry_to_name(&name, dentry);
272
273 error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
274 if (unlikely(error))
275 return -error;
276
277 ihold(inode);
278 d_instantiate(dentry, inode);
279 return 0;
280}
281
282STATIC int
283xfs_vn_unlink(
284 struct inode *dir,
285 struct dentry *dentry)
286{
287 struct xfs_name name;
288 int error;
289
290 xfs_dentry_to_name(&name, dentry);
291
292 error = -xfs_remove(XFS_I(dir), &name, XFS_I(dentry->d_inode));
293 if (error)
294 return error;
295
296 /*
297 * With unlink, the VFS makes the dentry "negative": no inode,
298 * but still hashed. This is incompatible with case-insensitive
299 * mode, so invalidate (unhash) the dentry in CI-mode.
300 */
301 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
302 d_invalidate(dentry);
303 return 0;
304}
305
306STATIC int
307xfs_vn_symlink(
308 struct inode *dir,
309 struct dentry *dentry,
310 const char *symname)
311{
312 struct inode *inode;
313 struct xfs_inode *cip = NULL;
314 struct xfs_name name;
315 int error;
316 umode_t mode;
317
318 mode = S_IFLNK |
319 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
320 xfs_dentry_to_name(&name, dentry);
321
322 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
323 if (unlikely(error))
324 goto out;
325
326 inode = VFS_I(cip);
327
328 error = xfs_init_security(inode, dir, &dentry->d_name);
329 if (unlikely(error))
330 goto out_cleanup_inode;
331
332 d_instantiate(dentry, inode);
333 return 0;
334
335 out_cleanup_inode:
336 xfs_cleanup_inode(dir, inode, dentry);
337 out:
338 return -error;
339}
340
341STATIC int
342xfs_vn_rename(
343 struct inode *odir,
344 struct dentry *odentry,
345 struct inode *ndir,
346 struct dentry *ndentry)
347{
348 struct inode *new_inode = ndentry->d_inode;
349 struct xfs_name oname;
350 struct xfs_name nname;
351
352 xfs_dentry_to_name(&oname, odentry);
353 xfs_dentry_to_name(&nname, ndentry);
354
355 return -xfs_rename(XFS_I(odir), &oname, XFS_I(odentry->d_inode),
356 XFS_I(ndir), &nname, new_inode ?
357 XFS_I(new_inode) : NULL);
358}
359
360/*
361 * careful here - this function can get called recursively, so
362 * we need to be very careful about how much stack we use.
363 * uio is kmalloced for this reason...
364 */
365STATIC void *
366xfs_vn_follow_link(
367 struct dentry *dentry,
368 struct nameidata *nd)
369{
370 char *link;
371 int error = -ENOMEM;
372
373 link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
374 if (!link)
375 goto out_err;
376
377 error = -xfs_readlink(XFS_I(dentry->d_inode), link);
378 if (unlikely(error))
379 goto out_kfree;
380
381 nd_set_link(nd, link);
382 return NULL;
383
384 out_kfree:
385 kfree(link);
386 out_err:
387 nd_set_link(nd, ERR_PTR(error));
388 return NULL;
389}
390
391STATIC void
392xfs_vn_put_link(
393 struct dentry *dentry,
394 struct nameidata *nd,
395 void *p)
396{
397 char *s = nd_get_link(nd);
398
399 if (!IS_ERR(s))
400 kfree(s);
401}
402
403STATIC int
404xfs_vn_getattr(
405 struct vfsmount *mnt,
406 struct dentry *dentry,
407 struct kstat *stat)
408{
409 struct inode *inode = dentry->d_inode;
410 struct xfs_inode *ip = XFS_I(inode);
411 struct xfs_mount *mp = ip->i_mount;
412
413 trace_xfs_getattr(ip);
414
415 if (XFS_FORCED_SHUTDOWN(mp))
416 return -XFS_ERROR(EIO);
417
418 stat->size = XFS_ISIZE(ip);
419 stat->dev = inode->i_sb->s_dev;
420 stat->mode = ip->i_d.di_mode;
421 stat->nlink = ip->i_d.di_nlink;
422 stat->uid = ip->i_d.di_uid;
423 stat->gid = ip->i_d.di_gid;
424 stat->ino = ip->i_ino;
425 stat->atime = inode->i_atime;
426 stat->mtime = inode->i_mtime;
427 stat->ctime = inode->i_ctime;
428 stat->blocks =
429 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
430
431
432 switch (inode->i_mode & S_IFMT) {
433 case S_IFBLK:
434 case S_IFCHR:
435 stat->blksize = BLKDEV_IOSIZE;
436 stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
437 sysv_minor(ip->i_df.if_u2.if_rdev));
438 break;
439 default:
440 if (XFS_IS_REALTIME_INODE(ip)) {
441 /*
442 * If the file blocks are being allocated from a
443 * realtime volume, then return the inode's realtime
444 * extent size or the realtime volume's extent size.
445 */
446 stat->blksize =
447 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
448 } else
449 stat->blksize = xfs_preferred_iosize(mp);
450 stat->rdev = 0;
451 break;
452 }
453
454 return 0;
455}
456
457int
458xfs_setattr_nonsize(
459 struct xfs_inode *ip,
460 struct iattr *iattr,
461 int flags)
462{
463 xfs_mount_t *mp = ip->i_mount;
464 struct inode *inode = VFS_I(ip);
465 int mask = iattr->ia_valid;
466 xfs_trans_t *tp;
467 int error;
468 uid_t uid = 0, iuid = 0;
469 gid_t gid = 0, igid = 0;
470 struct xfs_dquot *udqp = NULL, *gdqp = NULL;
471 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL;
472
473 trace_xfs_setattr(ip);
474
475 if (mp->m_flags & XFS_MOUNT_RDONLY)
476 return XFS_ERROR(EROFS);
477
478 if (XFS_FORCED_SHUTDOWN(mp))
479 return XFS_ERROR(EIO);
480
481 error = -inode_change_ok(inode, iattr);
482 if (error)
483 return XFS_ERROR(error);
484
485 ASSERT((mask & ATTR_SIZE) == 0);
486
487 /*
488 * If disk quotas is on, we make sure that the dquots do exist on disk,
489 * before we start any other transactions. Trying to do this later
490 * is messy. We don't care to take a readlock to look at the ids
491 * in inode here, because we can't hold it across the trans_reserve.
492 * If the IDs do change before we take the ilock, we're covered
493 * because the i_*dquot fields will get updated anyway.
494 */
495 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
496 uint qflags = 0;
497
498 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
499 uid = iattr->ia_uid;
500 qflags |= XFS_QMOPT_UQUOTA;
501 } else {
502 uid = ip->i_d.di_uid;
503 }
504 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
505 gid = iattr->ia_gid;
506 qflags |= XFS_QMOPT_GQUOTA;
507 } else {
508 gid = ip->i_d.di_gid;
509 }
510
511 /*
512 * We take a reference when we initialize udqp and gdqp,
513 * so it is important that we never blindly double trip on
514 * the same variable. See xfs_create() for an example.
515 */
516 ASSERT(udqp == NULL);
517 ASSERT(gdqp == NULL);
518 error = xfs_qm_vop_dqalloc(ip, uid, gid, xfs_get_projid(ip),
519 qflags, &udqp, &gdqp);
520 if (error)
521 return error;
522 }
523
524 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
525 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
526 if (error)
527 goto out_dqrele;
528
529 xfs_ilock(ip, XFS_ILOCK_EXCL);
530
531 /*
532 * Change file ownership. Must be the owner or privileged.
533 */
534 if (mask & (ATTR_UID|ATTR_GID)) {
535 /*
536 * These IDs could have changed since we last looked at them.
537 * But, we're assured that if the ownership did change
538 * while we didn't have the inode locked, inode's dquot(s)
539 * would have changed also.
540 */
541 iuid = ip->i_d.di_uid;
542 igid = ip->i_d.di_gid;
543 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
544 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
545
546 /*
547 * Do a quota reservation only if uid/gid is actually
548 * going to change.
549 */
550 if (XFS_IS_QUOTA_RUNNING(mp) &&
551 ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) ||
552 (XFS_IS_GQUOTA_ON(mp) && igid != gid))) {
553 ASSERT(tp);
554 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
555 capable(CAP_FOWNER) ?
556 XFS_QMOPT_FORCE_RES : 0);
557 if (error) /* out of quota */
558 goto out_trans_cancel;
559 }
560 }
561
562 xfs_trans_ijoin(tp, ip, 0);
563
564 /*
565 * Change file ownership. Must be the owner or privileged.
566 */
567 if (mask & (ATTR_UID|ATTR_GID)) {
568 /*
569 * CAP_FSETID overrides the following restrictions:
570 *
571 * The set-user-ID and set-group-ID bits of a file will be
572 * cleared upon successful return from chown()
573 */
574 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
575 !capable(CAP_FSETID))
576 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
577
578 /*
579 * Change the ownerships and register quota modifications
580 * in the transaction.
581 */
582 if (iuid != uid) {
583 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
584 ASSERT(mask & ATTR_UID);
585 ASSERT(udqp);
586 olddquot1 = xfs_qm_vop_chown(tp, ip,
587 &ip->i_udquot, udqp);
588 }
589 ip->i_d.di_uid = uid;
590 inode->i_uid = uid;
591 }
592 if (igid != gid) {
593 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
594 ASSERT(!XFS_IS_PQUOTA_ON(mp));
595 ASSERT(mask & ATTR_GID);
596 ASSERT(gdqp);
597 olddquot2 = xfs_qm_vop_chown(tp, ip,
598 &ip->i_gdquot, gdqp);
599 }
600 ip->i_d.di_gid = gid;
601 inode->i_gid = gid;
602 }
603 }
604
605 /*
606 * Change file access modes.
607 */
608 if (mask & ATTR_MODE) {
609 umode_t mode = iattr->ia_mode;
610
611 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
612 mode &= ~S_ISGID;
613
614 ip->i_d.di_mode &= S_IFMT;
615 ip->i_d.di_mode |= mode & ~S_IFMT;
616
617 inode->i_mode &= S_IFMT;
618 inode->i_mode |= mode & ~S_IFMT;
619 }
620
621 /*
622 * Change file access or modified times.
623 */
624 if (mask & ATTR_ATIME) {
625 inode->i_atime = iattr->ia_atime;
626 ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
627 ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
628 }
629 if (mask & ATTR_CTIME) {
630 inode->i_ctime = iattr->ia_ctime;
631 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
632 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
633 }
634 if (mask & ATTR_MTIME) {
635 inode->i_mtime = iattr->ia_mtime;
636 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
637 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
638 }
639
640 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
641
642 XFS_STATS_INC(xs_ig_attrchg);
643
644 if (mp->m_flags & XFS_MOUNT_WSYNC)
645 xfs_trans_set_sync(tp);
646 error = xfs_trans_commit(tp, 0);
647
648 xfs_iunlock(ip, XFS_ILOCK_EXCL);
649
650 /*
651 * Release any dquot(s) the inode had kept before chown.
652 */
653 xfs_qm_dqrele(olddquot1);
654 xfs_qm_dqrele(olddquot2);
655 xfs_qm_dqrele(udqp);
656 xfs_qm_dqrele(gdqp);
657
658 if (error)
659 return XFS_ERROR(error);
660
661 /*
662 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
663 * update. We could avoid this with linked transactions
664 * and passing down the transaction pointer all the way
665 * to attr_set. No previous user of the generic
666 * Posix ACL code seems to care about this issue either.
667 */
668 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
669 error = -xfs_acl_chmod(inode);
670 if (error)
671 return XFS_ERROR(error);
672 }
673
674 return 0;
675
676out_trans_cancel:
677 xfs_trans_cancel(tp, 0);
678 xfs_iunlock(ip, XFS_ILOCK_EXCL);
679out_dqrele:
680 xfs_qm_dqrele(udqp);
681 xfs_qm_dqrele(gdqp);
682 return error;
683}
684
685/*
686 * Truncate file. Must have write permission and not be a directory.
687 */
688int
689xfs_setattr_size(
690 struct xfs_inode *ip,
691 struct iattr *iattr,
692 int flags)
693{
694 struct xfs_mount *mp = ip->i_mount;
695 struct inode *inode = VFS_I(ip);
696 int mask = iattr->ia_valid;
697 xfs_off_t oldsize, newsize;
698 struct xfs_trans *tp;
699 int error;
700 uint lock_flags = 0;
701 uint commit_flags = 0;
702
703 trace_xfs_setattr(ip);
704
705 if (mp->m_flags & XFS_MOUNT_RDONLY)
706 return XFS_ERROR(EROFS);
707
708 if (XFS_FORCED_SHUTDOWN(mp))
709 return XFS_ERROR(EIO);
710
711 error = -inode_change_ok(inode, iattr);
712 if (error)
713 return XFS_ERROR(error);
714
715 ASSERT(S_ISREG(ip->i_d.di_mode));
716 ASSERT((mask & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
717 ATTR_MTIME_SET|ATTR_KILL_SUID|ATTR_KILL_SGID|
718 ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
719
720 if (!(flags & XFS_ATTR_NOLOCK)) {
721 lock_flags |= XFS_IOLOCK_EXCL;
722 xfs_ilock(ip, lock_flags);
723 }
724
725 oldsize = inode->i_size;
726 newsize = iattr->ia_size;
727
728 /*
729 * Short circuit the truncate case for zero length files.
730 */
731 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
732 if (!(mask & (ATTR_CTIME|ATTR_MTIME)))
733 goto out_unlock;
734
735 /*
736 * Use the regular setattr path to update the timestamps.
737 */
738 xfs_iunlock(ip, lock_flags);
739 iattr->ia_valid &= ~ATTR_SIZE;
740 return xfs_setattr_nonsize(ip, iattr, 0);
741 }
742
743 /*
744 * Make sure that the dquots are attached to the inode.
745 */
746 error = xfs_qm_dqattach(ip, 0);
747 if (error)
748 goto out_unlock;
749
750 /*
751 * Now we can make the changes. Before we join the inode to the
752 * transaction, take care of the part of the truncation that must be
753 * done without the inode lock. This needs to be done before joining
754 * the inode to the transaction, because the inode cannot be unlocked
755 * once it is a part of the transaction.
756 */
757 if (newsize > oldsize) {
758 /*
759 * Do the first part of growing a file: zero any data in the
760 * last block that is beyond the old EOF. We need to do this
761 * before the inode is joined to the transaction to modify
762 * i_size.
763 */
764 error = xfs_zero_eof(ip, newsize, oldsize);
765 if (error)
766 goto out_unlock;
767 }
768
769 /*
770 * We are going to log the inode size change in this transaction so
771 * any previous writes that are beyond the on disk EOF and the new
772 * EOF that have not been written out need to be written here. If we
773 * do not write the data out, we expose ourselves to the null files
774 * problem.
775 *
776 * Only flush from the on disk size to the smaller of the in memory
777 * file size or the new size as that's the range we really care about
778 * here and prevents waiting for other data not within the range we
779 * care about here.
780 */
781 if (oldsize != ip->i_d.di_size && newsize > ip->i_d.di_size) {
782 error = xfs_flush_pages(ip, ip->i_d.di_size, newsize, 0,
783 FI_NONE);
784 if (error)
785 goto out_unlock;
786 }
787
788 /*
789 * Wait for all direct I/O to complete.
790 */
791 inode_dio_wait(inode);
792
793 error = -block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks);
794 if (error)
795 goto out_unlock;
796
797 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
798 error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
799 XFS_TRANS_PERM_LOG_RES,
800 XFS_ITRUNCATE_LOG_COUNT);
801 if (error)
802 goto out_trans_cancel;
803
804 truncate_setsize(inode, newsize);
805
806 commit_flags = XFS_TRANS_RELEASE_LOG_RES;
807 lock_flags |= XFS_ILOCK_EXCL;
808
809 xfs_ilock(ip, XFS_ILOCK_EXCL);
810
811 xfs_trans_ijoin(tp, ip, 0);
812
813 /*
814 * Only change the c/mtime if we are changing the size or we are
815 * explicitly asked to change it. This handles the semantic difference
816 * between truncate() and ftruncate() as implemented in the VFS.
817 *
818 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
819 * special case where we need to update the times despite not having
820 * these flags set. For all other operations the VFS set these flags
821 * explicitly if it wants a timestamp update.
822 */
823 if (newsize != oldsize && (!(mask & (ATTR_CTIME | ATTR_MTIME)))) {
824 iattr->ia_ctime = iattr->ia_mtime =
825 current_fs_time(inode->i_sb);
826 mask |= ATTR_CTIME | ATTR_MTIME;
827 }
828
829 /*
830 * The first thing we do is set the size to new_size permanently on
831 * disk. This way we don't have to worry about anyone ever being able
832 * to look at the data being freed even in the face of a crash.
833 * What we're getting around here is the case where we free a block, it
834 * is allocated to another file, it is written to, and then we crash.
835 * If the new data gets written to the file but the log buffers
836 * containing the free and reallocation don't, then we'd end up with
837 * garbage in the blocks being freed. As long as we make the new size
838 * permanent before actually freeing any blocks it doesn't matter if
839 * they get written to.
840 */
841 ip->i_d.di_size = newsize;
842 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
843
844 if (newsize <= oldsize) {
845 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
846 if (error)
847 goto out_trans_abort;
848
849 /*
850 * Truncated "down", so we're removing references to old data
851 * here - if we delay flushing for a long time, we expose
852 * ourselves unduly to the notorious NULL files problem. So,
853 * we mark this inode and flush it when the file is closed,
854 * and do not wait the usual (long) time for writeout.
855 */
856 xfs_iflags_set(ip, XFS_ITRUNCATED);
857 }
858
859 if (mask & ATTR_CTIME) {
860 inode->i_ctime = iattr->ia_ctime;
861 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
862 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
863 }
864 if (mask & ATTR_MTIME) {
865 inode->i_mtime = iattr->ia_mtime;
866 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
867 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
868 }
869
870 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
871
872 XFS_STATS_INC(xs_ig_attrchg);
873
874 if (mp->m_flags & XFS_MOUNT_WSYNC)
875 xfs_trans_set_sync(tp);
876
877 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
878out_unlock:
879 if (lock_flags)
880 xfs_iunlock(ip, lock_flags);
881 return error;
882
883out_trans_abort:
884 commit_flags |= XFS_TRANS_ABORT;
885out_trans_cancel:
886 xfs_trans_cancel(tp, commit_flags);
887 goto out_unlock;
888}
889
890STATIC int
891xfs_vn_setattr(
892 struct dentry *dentry,
893 struct iattr *iattr)
894{
895 if (iattr->ia_valid & ATTR_SIZE)
896 return -xfs_setattr_size(XFS_I(dentry->d_inode), iattr, 0);
897 return -xfs_setattr_nonsize(XFS_I(dentry->d_inode), iattr, 0);
898}
899
900#define XFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
901
902/*
903 * Call fiemap helper to fill in user data.
904 * Returns positive errors to xfs_getbmap.
905 */
906STATIC int
907xfs_fiemap_format(
908 void **arg,
909 struct getbmapx *bmv,
910 int *full)
911{
912 int error;
913 struct fiemap_extent_info *fieinfo = *arg;
914 u32 fiemap_flags = 0;
915 u64 logical, physical, length;
916
917 /* Do nothing for a hole */
918 if (bmv->bmv_block == -1LL)
919 return 0;
920
921 logical = BBTOB(bmv->bmv_offset);
922 physical = BBTOB(bmv->bmv_block);
923 length = BBTOB(bmv->bmv_length);
924
925 if (bmv->bmv_oflags & BMV_OF_PREALLOC)
926 fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
927 else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
928 fiemap_flags |= FIEMAP_EXTENT_DELALLOC;
929 physical = 0; /* no block yet */
930 }
931 if (bmv->bmv_oflags & BMV_OF_LAST)
932 fiemap_flags |= FIEMAP_EXTENT_LAST;
933
934 error = fiemap_fill_next_extent(fieinfo, logical, physical,
935 length, fiemap_flags);
936 if (error > 0) {
937 error = 0;
938 *full = 1; /* user array now full */
939 }
940
941 return -error;
942}
943
944STATIC int
945xfs_vn_fiemap(
946 struct inode *inode,
947 struct fiemap_extent_info *fieinfo,
948 u64 start,
949 u64 length)
950{
951 xfs_inode_t *ip = XFS_I(inode);
952 struct getbmapx bm;
953 int error;
954
955 error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
956 if (error)
957 return error;
958
959 /* Set up bmap header for xfs internal routine */
960 bm.bmv_offset = BTOBB(start);
961 /* Special case for whole file */
962 if (length == FIEMAP_MAX_OFFSET)
963 bm.bmv_length = -1LL;
964 else
965 bm.bmv_length = BTOBB(length);
966
967 /* We add one because in getbmap world count includes the header */
968 bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM :
969 fieinfo->fi_extents_max + 1;
970 bm.bmv_count = min_t(__s32, bm.bmv_count,
971 (PAGE_SIZE * 16 / sizeof(struct getbmapx)));
972 bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
973 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
974 bm.bmv_iflags |= BMV_IF_ATTRFORK;
975 if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
976 bm.bmv_iflags |= BMV_IF_DELALLOC;
977
978 error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
979 if (error)
980 return -error;
981
982 return 0;
983}
984
985static const struct inode_operations xfs_inode_operations = {
986 .get_acl = xfs_get_acl,
987 .getattr = xfs_vn_getattr,
988 .setattr = xfs_vn_setattr,
989 .setxattr = generic_setxattr,
990 .getxattr = generic_getxattr,
991 .removexattr = generic_removexattr,
992 .listxattr = xfs_vn_listxattr,
993 .fiemap = xfs_vn_fiemap,
994};
995
996static const struct inode_operations xfs_dir_inode_operations = {
997 .create = xfs_vn_create,
998 .lookup = xfs_vn_lookup,
999 .link = xfs_vn_link,
1000 .unlink = xfs_vn_unlink,
1001 .symlink = xfs_vn_symlink,
1002 .mkdir = xfs_vn_mkdir,
1003 /*
1004 * Yes, XFS uses the same method for rmdir and unlink.
1005 *
1006 * There are some subtile differences deeper in the code,
1007 * but we use S_ISDIR to check for those.
1008 */
1009 .rmdir = xfs_vn_unlink,
1010 .mknod = xfs_vn_mknod,
1011 .rename = xfs_vn_rename,
1012 .get_acl = xfs_get_acl,
1013 .getattr = xfs_vn_getattr,
1014 .setattr = xfs_vn_setattr,
1015 .setxattr = generic_setxattr,
1016 .getxattr = generic_getxattr,
1017 .removexattr = generic_removexattr,
1018 .listxattr = xfs_vn_listxattr,
1019};
1020
1021static const struct inode_operations xfs_dir_ci_inode_operations = {
1022 .create = xfs_vn_create,
1023 .lookup = xfs_vn_ci_lookup,
1024 .link = xfs_vn_link,
1025 .unlink = xfs_vn_unlink,
1026 .symlink = xfs_vn_symlink,
1027 .mkdir = xfs_vn_mkdir,
1028 /*
1029 * Yes, XFS uses the same method for rmdir and unlink.
1030 *
1031 * There are some subtile differences deeper in the code,
1032 * but we use S_ISDIR to check for those.
1033 */
1034 .rmdir = xfs_vn_unlink,
1035 .mknod = xfs_vn_mknod,
1036 .rename = xfs_vn_rename,
1037 .get_acl = xfs_get_acl,
1038 .getattr = xfs_vn_getattr,
1039 .setattr = xfs_vn_setattr,
1040 .setxattr = generic_setxattr,
1041 .getxattr = generic_getxattr,
1042 .removexattr = generic_removexattr,
1043 .listxattr = xfs_vn_listxattr,
1044};
1045
1046static const struct inode_operations xfs_symlink_inode_operations = {
1047 .readlink = generic_readlink,
1048 .follow_link = xfs_vn_follow_link,
1049 .put_link = xfs_vn_put_link,
1050 .get_acl = xfs_get_acl,
1051 .getattr = xfs_vn_getattr,
1052 .setattr = xfs_vn_setattr,
1053 .setxattr = generic_setxattr,
1054 .getxattr = generic_getxattr,
1055 .removexattr = generic_removexattr,
1056 .listxattr = xfs_vn_listxattr,
1057};
1058
1059STATIC void
1060xfs_diflags_to_iflags(
1061 struct inode *inode,
1062 struct xfs_inode *ip)
1063{
1064 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
1065 inode->i_flags |= S_IMMUTABLE;
1066 else
1067 inode->i_flags &= ~S_IMMUTABLE;
1068 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
1069 inode->i_flags |= S_APPEND;
1070 else
1071 inode->i_flags &= ~S_APPEND;
1072 if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
1073 inode->i_flags |= S_SYNC;
1074 else
1075 inode->i_flags &= ~S_SYNC;
1076 if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
1077 inode->i_flags |= S_NOATIME;
1078 else
1079 inode->i_flags &= ~S_NOATIME;
1080}
1081
1082/*
1083 * Initialize the Linux inode, set up the operation vectors and
1084 * unlock the inode.
1085 *
1086 * When reading existing inodes from disk this is called directly
1087 * from xfs_iget, when creating a new inode it is called from
1088 * xfs_ialloc after setting up the inode.
1089 *
1090 * We are always called with an uninitialised linux inode here.
1091 * We need to initialise the necessary fields and take a reference
1092 * on it.
1093 */
1094void
1095xfs_setup_inode(
1096 struct xfs_inode *ip)
1097{
1098 struct inode *inode = &ip->i_vnode;
1099
1100 inode->i_ino = ip->i_ino;
1101 inode->i_state = I_NEW;
1102
1103 inode_sb_list_add(inode);
1104 /* make the inode look hashed for the writeback code */
1105 hlist_add_fake(&inode->i_hash);
1106
1107 inode->i_mode = ip->i_d.di_mode;
1108 set_nlink(inode, ip->i_d.di_nlink);
1109 inode->i_uid = ip->i_d.di_uid;
1110 inode->i_gid = ip->i_d.di_gid;
1111
1112 switch (inode->i_mode & S_IFMT) {
1113 case S_IFBLK:
1114 case S_IFCHR:
1115 inode->i_rdev =
1116 MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
1117 sysv_minor(ip->i_df.if_u2.if_rdev));
1118 break;
1119 default:
1120 inode->i_rdev = 0;
1121 break;
1122 }
1123
1124 inode->i_generation = ip->i_d.di_gen;
1125 i_size_write(inode, ip->i_d.di_size);
1126 inode->i_atime.tv_sec = ip->i_d.di_atime.t_sec;
1127 inode->i_atime.tv_nsec = ip->i_d.di_atime.t_nsec;
1128 inode->i_mtime.tv_sec = ip->i_d.di_mtime.t_sec;
1129 inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec;
1130 inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec;
1131 inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec;
1132 xfs_diflags_to_iflags(inode, ip);
1133
1134 switch (inode->i_mode & S_IFMT) {
1135 case S_IFREG:
1136 inode->i_op = &xfs_inode_operations;
1137 inode->i_fop = &xfs_file_operations;
1138 inode->i_mapping->a_ops = &xfs_address_space_operations;
1139 break;
1140 case S_IFDIR:
1141 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1142 inode->i_op = &xfs_dir_ci_inode_operations;
1143 else
1144 inode->i_op = &xfs_dir_inode_operations;
1145 inode->i_fop = &xfs_dir_file_operations;
1146 break;
1147 case S_IFLNK:
1148 inode->i_op = &xfs_symlink_inode_operations;
1149 if (!(ip->i_df.if_flags & XFS_IFINLINE))
1150 inode->i_mapping->a_ops = &xfs_address_space_operations;
1151 break;
1152 default:
1153 inode->i_op = &xfs_inode_operations;
1154 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1155 break;
1156 }
1157
1158 /*
1159 * If there is no attribute fork no ACL can exist on this inode,
1160 * and it can't have any file capabilities attached to it either.
1161 */
1162 if (!XFS_IFORK_Q(ip)) {
1163 inode_has_no_xattr(inode);
1164 cache_no_acl(inode);
1165 }
1166
1167 xfs_iflags_clear(ip, XFS_INEW);
1168 barrier();
1169
1170 unlock_new_inode(inode);
1171}